Automatic water-controller for boilers.



C. E. LINDGREN. AUTOMATIC WATER CONTROLLER PGB BOILEBS. l APPLICATIONFILED HALS, 1910. 974,085, f A Patented ocu 25,1910.

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UNTTED STATES PATENT OFFICE.;

CARL E. LINDGREN, OF DENVER, COLORADO, ASSIGNOR OF THREE-FOURTH T RUTHB. ALBERSON., ONE-EIGHTH TO FREDERICK A. DOUGLAJSS, AND ONE-EIGHTH TO Aand the pump is a cylinder in which islo- GEORGE M. THOR?, ALL OIE"DENVER, COLORADO.

AUTOMATIC WATER-CONTROLLER FOR BOILERS.

To all whom it may concern: i Be it known that LCAnL E. LINDGREmacitizen of the United States, residing in the cit and county of Denver,and State of Co orado, have 'invented `certain new and usefulImprovements in Automatic Water- Controllers for Boilers; and I dodeclare the 'following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which' itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

My invention relates to improvements` in.

means for automatically controlling the water supply of boilers, whetherof the stationary or locomotive type.

In my improved construction provision is made for automaticallyregulating the sup- Ely of steam to the pump which supplies the oilerwith water. This is accomplished by means of a perforated casing locatedin t-he 4steam dome ofthe boiler' and connected .by means of a pipe withthe pump. A float' located in the boiler carries a shell which surroundsthe erforated casing and is ada ted to cut o the supply of steam theretorom theboiler, when the oat is raised a predetermined distance. In otherwords, when the water reaches apredetermined depth in the boiler,beingthe highest level desired, the steam is cut off from the vpump 'andthe supply of water to the boiler ceases.

Then as the water lowers in the boiler, due

to the generation of the steam,` the float will drop and graduallyuncover the perforations in the casing and -allow steam to pass to thepump for the purpose of keeping up the supply of water. Interposed inthe pipe connection between the perforated casing steam pipe fromAentering the pump and' flooding the same. Y

Having briefly outlined my improved construction, I will proceed todescribe the,

same in detail, referenoe being made to the Specification of LettersPatent. i I, Patented Application filed March 2,' 1910. Serial No.546,954.

Oct. 25, 1910.

'accompanying drawin 4in which is trated an embodiment t iereof.

In this drawing: Figure 1 -is a fragmentary view of a boiler equippedwith my im- V'illus-4 provement, the connections between the boiler andthe pump being also illustrated. Fig. 2 is an en ar'ged sectional view,ofthe perforated casing and the float carrying the steam cut-oil shellor hood. Fig. 3 is a sectional view taken through the tension cylinder,the spring-actuated'piston being shown in its normal position or whenthe steam from the boiler is cut off from communication therewith." Fig.4 is a similar view showing the piston acted on by the steam to allowthe latter to pass to the pump. Figs. 3 and 4 are shown on a largerscale than the corresponding construction in Fig. 1. g

.The same reference characters indicate the same parts in all the views.

Let4 the numeral 5 designate the .boiler which, as shown inthe drawing,is equipped with a dome 6 in which is located a perforated casing 7 fromwhich leads a pipe, 8 to a cylinder 9 containing a piston 10 acted on byva coil spring 12, one extremity of which .is engaged by a. follower 13which is in-turn engaged by a'tension-screw 14 threaded in the. ca 15 ofthe cylinder. From this cylinder Ileads a pipe 15 to the pump. This pipe15 is located near one extremity of the cylinder, namely, that where thepipe 8 enters. Connected with the pipe 8 between the boiler and thecylinder -is a of condensation from the pipe 8. The

Vspring 12 should be maintained at such a tension that the piston 10will -not vmove against the 'spring suiriciently Vto uncover the pipe15, until the steam pressure is suflicient to operate the pump. Hence,after the steam is eut off from the pipe 8 and the lat- 4ter begins tocool, the spring 12 will act on the piston 10 'and throw the latter tothe `position shown in Fig. 3, whereby communication between the pipe 8and'thepump is cut Voff, 'thus preventing `the water of condensationfrom entering the pump. Located wit-hin the boiler 5 below the dome 6isa float. 18 u on which is mounted a shell or hood 19 which surrounds theperforated casing 7 and is adapted to cover perforated wall of thecasing when' the'boxler is full, the float in`this event being finftliel I positienshown in Fig. 1. This Shen apio-f vided at its upperextremity lwith an 1nwardly pr'ojectlng flange 2O 1n which is located apacking ring 21 to prevent-the entrance ofsteam. This angeis adapted toengage a shoulder 22 formed on thelower part of the casing, when thehood is at its lowest limit of downward movement, or in position touncoverv all ofthe perforations l off from communication. with thesteam,

hence the steam cannot pass to the pump and the latter'will cease tooperate. Now as the water'is used' in the boiler 'for the generation ofsteam, its level falls and the float moving downwardly therewith gradfually uncovers the perforations of the Casing 7 and allows steaml toenter the pipe 8.

- If this pipe is coldwhen thesteam 'enters it,

there will be some water lof condensation which, however, Will be caughtby .the receptacle'or trap' 17. However, as the hood descends a greatervolume of .steam enters the pipe 8 and when the pressure s ullicient forthe purpose, the piston 10 will be moved against its spring 12asuilcient distance to uncover the extremity of the pi e 15 communicatingwith the cylinder 9, a owing the steam-to pass qto the pump which, beingset,

inmoti'on, will supply the boiler with water through -the feed p1pe23 Byvirtueof the c and the spxring 12, together with the follower 13 and .te tension screw 14, provision is made whereby ,the steam is preventedfrom passihgto the ypump until the pressure is sucient to' start'the-latter, and when thel steam pressure 'rises to this extent, .thelpiston will' be movedsutliciently to uncover the pipe 1'5 and allow thesteafnato pass-to the pump for operatin purposes'.A In the-meantime, itwill be un erstood that' thewater of condensation -is cut off from thepump and' caused toenter the trap' or receptacle 17.

The pipe 8 is provided with a valve 24 which is normally open but whichmaybe closed when for -any reason it may be de-l sirerl to do so.

Having thus described invention, what I claim l1. The combination' witha boiler, 'a pum and a connection between the lboiler. and t `e vylinder 9, the piston 10 pump 4for sup lying water to the former,.

of a perforate casing located in the steam space o'f the boiler abovethe water level, `t e said casing havinga shoulder formed onitslowerextremity, a pipeconnection between the said casing and the pump, a

hood surrounding the said casing and vertically movable thereon, thesaid hood having a flange surrounding the upper extremity .of the hoodand adaptd to come into engagement with the shoulder formed on thecasing to limit the downward movement of the hood, and a float connectedwith the hood, and arranged to` rise and fall a'svthe water levelfluctuates in the boiler, for the purpose set forth. y

2. The `combination 'with a boiler and a pump connected with the boilerto supply.

water thereto, of a perforated casing .located in the dome of theboiler; a pipe connection between the casing and the pump,

a cylinder interposed in the. pipe leading' from the casing to the pump,a spring-actuated piston therein normally 'arranged tocut offcommunication between the said pipe connection and the pump, a trapinterposed between the said casing and the cylinder for catchin thewater of condensationbetween the cylinder and \the casing, and afloatactuated hood located in the boiler connected in operative relationwith the perforated casing, whereby as the water rises and falls in theboiler the entrance of steam to the casing is auto1natically regulated.

3. The combination with a boiler, a pump, and a pipeconnection bet-Weenthem forsupplying steam to the pump, and a connection -between the pumpand boiler-for supplying water to the latter, of a perforated-casinglocated in the steam s ace of the boiler.. abovethe water levelan incommunicationI with the pipe connection between the boiler and pump, thesaid casing having a shoulder 'on its lower extremit and float-actuatedhood located inthe boi er slidably supported on the casing forregulating thepassage of steam to the perforated ca'smg as the waterAlevel uct-uates in the boiler, the said hoodhaving a'flangevsurrounding the said upper extremity .of the 4'hood and adapted* tocome into engagement with-'the shoulder formed onthe casin to limit the|downward movement 'of the ood, for the purpose'set forth.

' 4L The .combination with a boiler, a pump, and' a connectionbetweenthe Vpump and a perforated casing located in: the boiler above the'waterV level, floatfactuated means ada ted ,to openand close theperfor-.ations I of e s aidcasing as'the'wat'er iluctua-tesin .theboiler, a pipe leading-from -the' said' ca s' muncates, a piston in saidcylinder,jaspring 4acting on the piston, a follower engaging the enscrew. arranged teact on los boiler for supplying water to the latter,of

the follower for regulatin the springs. tension, andwapipe leading omthe cylinderl to the pump, vtheconstruction being such that the istonwhen in 'its normal position cuts 'oil' t e' passage ofsteam from thecylvinder vto the pump, while when the piston -is acted on by the steampressure Aof the boiler, t-he piston is moved against the tension of thespring to permit the passage of steam to the pump," substantially asdescribed.'

'5.. The combination with a boiler, a pump,

and a connection between the pump and the boiler' for. supplyingwater'to'thelatter, of

`a' perforated .casing located in the steam space Aof l' the boiler, afloat-actuated hood haring a telescopiciconnection with theperforated-casing, a pipe connection between the said casing and thepump, and a springactuated pistoninterposed in the said pipeconnectionka spring acting on the piston, a

`fo1lower engaging the spring, a tension in presence of-tWo witnesses.

CARL E. LINDGREN.

Witnesses:

VIRGINIA I. DAVIS, ELIZABETH BOWEN.

